Tyson Fury will meet Alexander Ustinov at Manchester's Phones 4 U Arena on Saturday following Dereck Chisora's injury-enforced withdrawal from the main event.
Chisora pulled out of the rematch, which is to be rescheduled, with a fractured hand but Fury will still be in action with Ustinov providing a high-quality alternative.
The 37-year-old has won all but one of his 30 fights with his only defeat coming against respected Bulgarian Kubrat Pulev, who faces Wladimir Klitschko in September.
Ustinov was helping Chisora prepare for the British showdown and inflicted the broken hand during sparring that forced promoter Frank Warren to search for a replacement opponent.
"The first thing is I'm happy to still be fighting this Saturday and that the fans will get what they paid for and see a good fight," Fury said.
"We've had a hard training camp and I'm in the shape of my life, expecting to knock out Chisora, but now I'm going to have take it out on Ustinov and make sure he takes the full force of my anger.
"Strangely, I'm going to break the man who broke Chisora's hand."
Ustinov stands 6ft 7in and weighs 22 stone and is ranked in the top 10 of two governing bodies. His knockout record reads 21 stoppages in 29 wins.
"Under the circumstances, Ustinov is a brilliant replacement for Chisora at this late stage," Warren said.
"He's fit and ready after training and sparring for two weeks with Chisora at his gym, he's got a great record, like Fury he's (a) giant of a man and has got some serious knockout punch power."